What's the price difference between spray foam and fiberglass for a Calgary basement?

Closed-cell spray foam costs roughly two to three times more than fibreglass batt insulation upfront, but the total price gap narrows significantly when you account for the additional materials fibreglass requires to perform safely in a Calgary basement. Understanding the true cost comparison requires looking at the complete wall assembly, not just the insulation material alone.

Closed-cell spray foam runs $3.00 to $5.00 per square foot at 2 inches in Calgary, delivering R-13 and acting as its own vapour barrier and air seal. For a typical basement with 1,200 square feet of wall area, that's $3,600 to $6,000 for the spray foam component. Because it adheres directly to the foundation and seals every crack and irregularity, you don't need separate vapour barrier poly, and the air-sealing alone reduces heat loss significantly. You'll still need framing and drywall over top, but the insulation step is a single application.

Fibreglass batt insulation costs $1.50 to $3.00 per square foot installed, putting a full basement at $1,800 to $3,600 — clearly cheaper at first glance. But here's the critical catch: fibreglass batts must never be installed directly against a Calgary foundation wall. Fibreglass absorbs moisture, and when compressed against cold concrete, it traps condensation and becomes a mould factory. Calgary's chinook winds make this worse by rapidly cycling wall temperatures, increasing the frequency of condensation events. To use fibreglass safely, you need a rigid foam thermal break ($1.25 to $2.50 per square foot for 2-inch XPS) against the concrete first, then framing, then fibreglass between studs, then a 6-mil polyethylene vapour barrier on the warm side. That rigid foam layer adds $1,500 to $3,000, plus the poly sheeting and taping.

When you compare complete assemblies for 1,200 square feet of wall, the numbers look like this: spray foam plus framing and drywall totals roughly $9,000 to $16,000. A rigid foam plus fibreglass plus vapour barrier plus framing and drywall assembly comes in at $8,500 to $15,000. The actual price difference on a complete basement is often only $1,000 to $2,000 — far less dramatic than the per-square-foot material comparison suggests.

Where spray foam delivers lasting value is in air sealing and moisture management. Calgary homes, especially those built in the 1960s through 1980s in suburbs like Canyon Meadows, Dalhousie, and Woodbine, often have rough, irregular foundation walls with minor cracks from decades of chinook-driven freeze-thaw cycles. Spray foam conforms to these surfaces and seals imperfections that rigid board and fibreglass simply bridge over, leaving gaps where air and moisture can penetrate.

Either approach can meet the Alberta Building Code's R-20 minimum for below-grade walls, and both require half-inch drywall as a thermal barrier. Get quotes from multiple contractors to compare — browse basement renovation professionals through the Calgary Construction Network to find experienced installers in your area.